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Acetaminophen (APAP) overdose induces apoptosis-inducing factor (AIF)-dependent necroptosis,but the mechanism remains obscure.The present study investigated the role of receptor interacting protein (RIP)l,a critical mediator of necroptosis,on AIF-dependent necroptosis during APAP-induced acute liver failure.Mice were intraperitoneally injected with APAP (300 mg/kg).As expected,hepatic RIP 1 was activated as early as 1 h after APAP,which is earlier than APAP-induced hepatic RIP3 upregulation.